looking at the types of voters that were supportive of mitt romney versus his primary supporter rick santorum. evangelical voters weren't as supportive of mitt romney early on. there were class divides. we're looking at the demographic data because that's one thing the president's team has made clear they're relying on to turn out the vote for him, the demographic groups that tend to back him. younger voters, african-americans, younger women. they do really inform the types of people you're out to get at the polls. sometimes, for example, there's the health care... 50% of voters favored repealing some or all of obama care. that shows it's a divided country but that doesn't suggest who will win tonight. >> i think we ought to em fa that these exit polls have been done for many years. we have had trouble in some years. i don't expect there will be trouble this year. those of us in this business that have been doing it understand that we have to treat these very tentative lie and at the end of the day people are voting to elect the next wt and the next congress. we're really going to wait for th